Device for attachment of electric conductors to insulators



F. H. KREBS. DEVICE FOR ATTACHMENT 0F EILECTRlC CONDUCTORS T0 INSULATORS.

APPLIQATION FILED JUNE 4, 1919- 1,346,128.

- Patented July 13, 1920.

other modification,

UNITED mmeirw' mcef Y rnnnniuok HENRY KREBS, OFVFREDERIKS'BERG, NEAR cornnrmeniv; DENMARK.

DEVICE FOR ATTACHMENT or nrnc'rniocoivnucrons r0 'insULA'roRs.

To all whom it may concern:

Beit known that I, Fnnnnnrcn -HENRY- K rnns,-- electrical engineer, citizen 2 of the Kingdom of Denmark,residing at Frederiksberg, near Copenhagen, Denmark, have invented newand useful Improvements in Devices. for Attachment of Electric Conductors to Insulators, of which the following is a specification. v c 1 The present inventionvhas for its object a device for attachment of electrical conductors andthe like to insulators or other sup, ports. I v

The inventionis illustrated on the drawing, where v I Figure 1 shows afragmentary side elevation of my invention; I

Fig. 2 shows a fragmentary side elevation of a modification,

Figs. 3 and 4 show a similar view of an Fig.5 shows a similar View of a still further modification, and

Figs. 6 and 7 details shown in Fig. 5. v

Heretofore'the fastening of an electrical conductor to an insulator has mainly been effected'bythe 'so-called bindings. These 5 are made of suitable wirestied on, by cas ual workmen-more rarely by really skilled erectois-as single or double cross-windings.

Use has also been made of clips partly formed before being placed in position. The placing of such clips requires the use of tools, however, in order to complete the forming of the clips in the'field. Theron sequence oflthese working processes is that many bindings arenot made with sufficient care, and the conductor is frequentlyexposed to damage, whlch drawback becomes most serious as an efficient inspection of each" single binding is practically impossible. Sources'offaults in the net willeasily be. the result hereof.

,In order to"avoid these drawbacks, use

' -Inaybe made of the device specified in the followingfall parts being previously adjusted in the shop and being adapted to be securely erected by unskilled workmen,

without the latter having to touch the conductor with any tool. The further advantage is attained that any'subsequent-undoing I of the bindings, for instance for the pur- '1 pose o f tightening orrenew'ingthe conduc tor, will be easy to perform.

Specification of Letters Patent.

of the structure Patented J Ely-13, 1920.

Application filed 'Iune4, 1919. SerialiIiTo. 301,747.

fastening device. A one strap-half 23- is here hoop-shaped and isfitted, at one end, with a bearing 28 for an intermediate link 25, whereto the other band 24 is attached, while the When-the link 25 is turned away from the position 25, a lug 30 on the link 25 lifts the latter slightly from its'seat in the bearing 28. Being actuated by the tension in the hoops 23 and 24, the link will again sink somewhat during thelast portion ofits ro-- tation and will therefore beheld in theposition 25. By inserting the hoop 23 more or 'lessdeeply'in the notch 29 of'the link 25, whenthe said'link occupies the position 25, the length of the hoop 23 may be adjusted in such a manner that the proper tensions are attained in each 1nd1v1du-al case.

link 25 is occupying the position r In Fig.2, 51 is the insulator, 53 and 54 f the strap-halves and 55 the intermediate link consisting of a stampedplate whose one end 56 rests'in a bearing 58 made in one with the strap-half 58, while the strap-half 5a is shapedas a loopwhose ends 59 are hookshaped and are hooked into holes 60 in'the intermediate link 55. The bearing surface of the bearing 58 is-curved in such a manner that, the link 55, while being moved 7 out from'the position 55, causes the not shown conductor to be gradually pulled toward the insulatorfl5l and then towardthe links extreme position 55 shown by dottedlines,the

conductor being allowed to recede only 'to' the slightest possible extent. Hereby/the result is attained that the erection is rendered easier, and also that the proper ten sions in the individual parts aresecured.

If several holes 60 are provided, the length of the -device may be altered whereby for instance-differences in the insulator diameters may be equalized, and the tensions may be varied.

(catcher), while the other part 74 is fastened to a body 79 fitted with a bearing'78. The bearing .78 is of similar shape as the bearing. .58 in Fig. 2. 75 is the intermediate linkwhich is fitted with a rivet 80 serving as fulcrum for the intermediate linkturn- V r w Zing and moving in the bearing 78. The Fig. l there is shownone form of my link 75 is further fitted with 'notches Sl,

wherein the loop 74 may be hooked. The strap-part '74- .is constructed, like the strap part 73 as a loop with a catcher 77.

In placing the conductor it is of great importance to have it fastened in such a manner that it cannot later on slide on the insulator, as this has a wearing effect on the wire and on the insulator as well. Care must also be taken to prevent the wire from becoming detached in case of'rupture between two poles, and the clip arrangement with the intermediate membershouldthere fore be constructed with this case in view. The very bending of the conductor 72, along the insulator, as produced by the tightening device, tends strongly to prevent such longitudinal i'novement, which may be further prevented by'the catchers 76 and 77 being shaped in such a manner that they prevcntthe wire from sliding through these catchers. F or instance the'catchers 7G, 77 in l ig. 3 may be shaped in such a manner, Fig. 41-, that the wire becomes pinched therein, whereby thewire is prevented from sliding in the hook. This may be carriedout for instance 'bythe notch 82 being made wed geslmped.

If the catchers 7G, 77 for instance are'fur their fitted with lugs or noses 86, 87, the result is attained that if the conductor 72 breaks close to the insulator, the bend will partly be maintained by the catcher, as the noses will prevent the conductor 72 from being straightened out in the catcher whereby-the wire is further secured in the 631116.

In Fig. 5, 91 is the insulator and 93, 94 are the clip-halves. lVhile the member 94 shaped. as a loop (Fig. 7), the member 93 may, for instance, be drop-forged or stamped from a suitably shaped plate (Fig, 6), and is fitted, at 96, with a hook and is connected with a member 98 shaped as a bearing, wherein the pin 100 of the intermediat member may move. The intermediate melnl'ier 95, shown, is fitted with holes 101 wherein the hook-shaped ends 10 1-. of the loop 94. are inserted and come into contact with one another in such a manner (Fig. 7) that a subsequent straightening out of the hooks in consequence of the tensile forces will be prevented. A wrench 105 is used for placing the device in position, especially for turning the intermediate link. The bearing 98 may be fitted with a hole 108 for a suitable bolt, in order to provide an electrically conductive connection with a branch-wire or turnout. p

In order to protect the conductor 102, for instance where metals of different hardness come in contact with one another, there may for instance be inserted linings 106, 107 of suitable shape and material between the hook 96 and the bearing surface 97 of the loop. Y

In order to be able to use the same tightening device for several wire diameters, insulator ;limensions and the like, the individual parts of the fastening device are adjusted at the factory and stamped with information in that respect. The loop-parts, for instance, may be given the lengths corresponding to-the standard diameters of insulators. A final adjustment may be performed during theerection, for instance the band-shaped member 26 in Fig. 1 may be shortened, as mentioned above, by the insertion of the hook in the lever 25, and the length of the intermediate link in Figs. 2, 8, 5 may be adjusted by the provision of several. holes. or notches wherein the loop may be inserted.

Experience has demonstrated the great importance of the fastening device fitting well against the insulator along the largest possible portion of the circumference of the same. The insulators, even of the same Jake and pattern, not being entirely alike, however, the lengths must be varied, for instance in the manner mentioned above, but care must also be taken for the strapparts proper to be bent into contact with the insulator for the longest possible distances when actuated by *the tensions produced by the erection. It is important, for instance, that the strap-parts in Fig. 2 at the portions with notation marks 03, 54, and in Fig. 3 at the portions 73, 74, as well as in Fig. 5 at the portions 93, 94, should fit closely against the insulators, and for that reason the strap-parts are given such shape and profile that bending or fitting is facilitated, and a reliable contact is attained.

By the devices shown, there may be attained very considerable tensions, greatly exceeding those otherwise attainable by ordinary bindings and thereby, the conductor may be immovably fastened to the insulator which is of great importance for the durability of the conductor as well as of the insulator.

The intermediate link 75 (95) may be constructed in such a manner that it may be removed afterthe straps 73 and 74 (93 and 94:) have been tightened about the insulator, the said intermediate link being then constructed in such a manner that the straps 74: (9-1), after being tiglltened, slides out from the intermediate link and down on a hook or a notch in the bearing-shaped member 78 (9S), whcreaftcr the intermediate link is removed.

By suitable selection of the shape of the curved bearing surface between the link members -5S, 7578 and SIS-98, the necessary power to be applied in mounting the device maybe reduced to a minimum.

Having now particularly described and ascertained the nature of my said invention and the manner in which the same is to be performed, I declare that what I claim is 2-- 1. A device for attachingline wires to insulators comprising a pair of bands located. one on either side of the insulator and having ends engaging the line wire at spaced intervals, and means for forcing the free ends of thebands toward each other comprising means permitting the slackening of thebands during the forcing operation.

'2. A device for attaching line wires to insulators comprising a pair of bands located one on either side of the insulators and having ends engaging the line wire at spaced intervals and means, comprising a member, one end of which is loosely pivoted in one of said bands, for forcing the free ends of the bands toward each other.

3. A device for attaching line wires to insulators comprising a pair of bands located one on either side of the insulator and having ends engaging the line wire atspaced intervals and means for forcing the free ends of the bands toward each other, said means being a hinge, comprising a bearing member, connected to the free end of one of the bands, and a link, being attached to the free end of the other band and ournaled in the bearing member, the latter being shaped in such a manner that the link, during its rotation in the said bearing member, for the purpose of tightening the bands and the line wire about the insulator, slides in the said hearing member, at right angles to its axis of revolution therein whereby a slight retrograde and therefore slackening motion of the line wire is allowed during erection,

shortly before the link has reached its final.

position.

4. A device for attaching line wires to insulators comprising a pair of bands located one on either side of the insulator and having ends engaging the line wire at spaced itervals and means for forcing the free ends of the bands toward each other, said means being a hinge, comprising a bearing member, connected to the free end of one of the bands, and a link, beingfattached to the free end of the other band and journaled and free to slide in the bearing member, so that the link by being turned in the bearing member, tightens the bands and the line Wire 7 about the insulator, the said bands engaging the line wire at a. spaced interval 1n such a manner that when they become actuated by the tensions produced by the process of erection, they will adjust themselves closely to the largest possible portion of the circumference of the groove of the insulator.

5. A device for attaching line wires to insulators comprising a pair of bands located one on either side of the insulator and having ends engaging the line wire at spaced intervals and means for forcing the free ends of the bands toward each other, said means being a hinge,comprising a bearing member, connected to the free end of one of the bands, and a link, being attached to the free end of the other band and journaled and free to slide in the bearing member, so that the link by being turned in the bearing member, tightens the bands and the line wire, which is gripped by catchers on the end of the bands, closely about the curved insulator surface, the said catchers being shaped in such a manner that they firmly grip the line wire and prevent any motion of the wire through the catchers after its securing.

6. A device for attaching line wires to insulators comprising a pair of bands located one on either side of the insulator and haying ends engaging the line wire at spaced intervals and means for forcing the free ends of the bands toward each other, said means being a hinge, comprising a bearing member, connected to the free end of one of the bands, and a link, being attached to the free end of the other band and journaled and free to slide in the bearing member, so that the link by being turned in the bearing member, tightens the bands and the line wire, which is gripped by catchers on the end of the bands, closely about the curved insulator surface, the said catchers being shaped in such a manner that they firmly grip the line wire and prevent any motion of the wire through the catchers after its securing, there being provided, between the catchers and the line wire, linings preventing any damage of the line wire at the places where the catchers take hold of the wires.

In witness whereof, I have hereunto signed my name in the presence of two subscribing witnesses.

FREDERICK HENRY KREBS.

- Witnesses:

CARL 'MEMMINGSEB'I, JULIUs SELIMANN. 

